I get this error message and Zotero does not launch. There's also a yellow triangle on the Zotero logo.

I'm using the latest version of Zotero so it seems like the solutions suggested in earlier replies for similar problems (i.e., installing the latest version) do not apply. The same version used to work until today.

I'm afraid that's a generic error and doesn't provide any additional info. Did you make any changes in Firefox before the error occurred? Have you tried disabling other extensions?

You might try removing the files compreg.dat and xpti.dat in the Firefox profile directory with Firefox closed and seeing if that fixes the error. The files will be regenerated on the next load.

If that doesn't work, you could enable the debugging pref extensions.zotero.debug.log in about:config and start Firefox via the command line (Start, Run, "C:\Program Files\Mozilla Firefox\firefox.exe -console" on Windows) to see if there's additional info in the debug output.

That doesn't help either, I'm afraid. Did you try the steps I suggested above, removing compreg.dat and xpti.dat from the Firefox profile or using the debug pref? We'll probably need debug console output to figure out what's happening here.

storey: I'm not sure why it's not throwing a more descriptive error in the error console, but if it's not getting further than "Opening database 'zotero'", that's not a great sign. You might try grabbing the SQLite command-line client and opening zotero.sqlite directly to see if it gives you an error message.

If it does open, you can run "PRAGMA integrity_check;" to check for DB corruption.

Did this error start when upgrading to b4.r5 or at some other time? Do you actually have data in your SQLite DB? (If not, you can of course just delete the Zotero data directory and start over.) If you do have data and aren't having any luck opening the file, feel free to send it to support@zo.....org, and we can take a look.

I suspect it probably did happen with the upgrade. At some point when I started firefox it reported that there was an update available and I let it go ahead and get the update. I'll tar up the directory and send it to your support e-mail.

I tried e-mailing the whole directory including attachments ~9Meg and hit the size limit for your support e-mail. However I think I've found my problem. I had a file zotero.sqlite-journal which the OS said was busy and couldn't be removed. I renamed the directory and moved everything but that file back to the old directory and I'm back in business.

Same problem, Windows XP. In my case I found a zombie firefox process listed in Windows Task Manager, after closing firefox. It wasn't preventing a restart, but was locking the sqlite-journal file. Killed that process and then I could delete the journal file.